Properties of the Number 81909

Eighty-One Thousand Nine Hundred Nine

Basics

Value: 81908 → 81909 → 81910

Parity: odd

Prime: No

Previous Prime: 81901

Next Prime: 81919

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 19 × 479

Divisors: 1, 3, 9, 19, 57, 171, 479, 1437, 4311, 9101

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111111110101

Octal: 237765

Duodecimal: 3B499

Hexadecimal: 13ff5

Square: 6709084281

Square Root: 286.19748426567276

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

[ (3rd elementary symmetric function of S(n))/(first elementary symmetric function of S(n)) ], where S(n) = {first n+2 positive integers congruent to 1 mod 4}. A24386

a(n) = 3ⁿ(n² - n + 18)/18. A81909